Not signal of SIM

[asunni2009]

My m2 Max phone yesterday, April 5, 2020 updated the security patch and this damaged my connection to the cellular network, I get the error "no SIM card", and when trying to update it appears "invalid device id: null" could you help me please thanks

[Y_ASUS]

Hi asunni2009,
Please try deactivating and activating the SIM.
Does the problem appear on other SIM cards?
Please tell us your operator name and country.
Could you tell us your current firmware version? Settings > System > About phone > Build number
Could you show us a screenshot of the problem?
Thank you 🙂